Comment 63 for bug 401126

I have been able to keep the wireless connection up for half an hour or so of fairly heavy use, by adding the kernel parameters:

iommu=force swiotlb=524228

For more info check the following:
http://bbs.archlinux.org/viewtopic.php?pid=649614
http://lwn.net/Articles/91870 this one is a bit old, but still may be relevant.